| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve the cost reduction and high optical performance with respect to a zoom lens. <P>SOLUTION: The zoom lens comprises a negative first lens group G1 and a positive second lens group G2 in order from the object side, the first lens group G1 comprises a negative first lens L11 and a positive second lens L12, and the second lens group G2 comprises a positive third lens L21 and a negative fourth lens L22. The zoom lens satisfies conditional formulae (1) 1.56<nd2<1.68, (2) νd2<32, (3) 1.56<nd4<1.68, (4) νd4<32, and (5) 0.22<d12/fw<0.60 where nd2 and νd2 are a refractive index and an Abbe number at the d-line of the second lens L12 respectively, nd4 and νd4 are a refractive index and an Abbe number at the d-line of the fourth lens L22 respectively, and d12 is an air gap on an optical axis between the first lens L11 and the second lens L12. <P>COPYRIGHT: (C)2013,JPO&INPIT |
